I've been given a copy of CSM flight sim version 9. I'm going to use this to help learn to fly a helicopter. My question is would this be good enough or should i get a more modern sim.(I was thinking of aerofly pro).

CSM v10 is better but v9 is not bad, particularly for learning helis. The main thing missing is that it does not model heading hold gyros so you actually have to fly all the controls all the time. Good practise but hard work.

There are some advantages to the newer sims if you can afford them but I don't know Aerofly well enough to recommend it over the others.

Steve

I know the chopper guys rave about G2.

You might want to look into whether Aerofly or G2 would be best for your needs...